Shapes and calculators for spherical coordinates


The edges of a spherical polygon are geodesics (segments of great circles), not straight lines. Projected to the plane, geodesics are curves in all map projections except gnomonic, and thus accurate projection requires interpolation along each arc.

D3 uses adaptive sampling inspired by a popular line simplification method to balance accuracy and performance.

Node.js is an event-based server-side JavaScript engine.

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Install this software package

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Install node-d3-geo